docs: def normalize_request_headers(request):
      r"""Function used to transform header, replacing 'HTTP\_' to ''
      and replace '_' to '-'
  
      :param request:  A HttpRequest that will be transformed
      :returns:        A dictionary with the normalized headers
      """
      norm_headers = {}
      for header, value in request.META.items():
          if required_header(header):
              norm_header = header.replace('HTTP_', '').title().replace('_', '-')
              norm_headers[norm_header] = value
  
      return norm_headers